check engine light won't turn off 98 kouki

[jaymatic]

so I just got my 98 kouki about last week. when I bought it, the guy said that the only problem was that my front o2 sensor burned out (which I changed 2 days ago). but then the CEL was still on, which I found odd since that was the only flaw with the car. I went to a friend, who's a mechanic, told me that the tranny has been switched from automatic to manual. He said that the CKP sensor has been modified, it had a washer and tape for some reason so it could fit in the tranny which, he installed a new one for me. And, the downstream o2 sensor has been converted to an upstream and also burned out (idk why lol.) I also replaced the o2 sensor near the catalytic which was the converted one. Still, the CEL is on. My car also doesn't have a neutral safety switch. Any reason why my CEL is still on and how can I take it off? Thank you!

[ZERTA RACING]

Have your mechanic friend pull the codes for you and fix the codes it is throwing....\ thread

Ps. Its probably still got a AT ecu and needs to be wired correctly once the MT ecu is installed. Also use the small questions thread for little questions like this to get better help and not get flamed.

[jaymatic]

haha sorry about that whoever is viewing this, kinda new on here.

[Ilya]

You will have a CEL on a 98 S14 until you get a manual ecu. The auto ECU freaks out when it doesnt see an Automatic Transmission. There is also a crank shaft position sensor that goes on top of a manual transmission and I am not sure if you need that one as well and the Manual ECU or just a manual ECU. Gotta hate buying unfinished projects cars.

[ZERTA RACING]

You will have a CEL on a 98 S14 until you get a manual ecu. The auto ECU freaks out when it doesnt see an Automatic Transmission. There is also a crank shaft position sensor that goes on top of a manual transmission and I am not sure if you need that one as well and the Manual ECU or just a manual ECU. Gotta hate buying unfinished projects cars.

You are correct, and obd2 car will need the crank angle sensor (CAS) or the computer will flip out. Even with a manual ECU the car will still throw a CEL unless it is wired up correctly with the neutral signal and 5th gear. There are tons of write ups on this OP search google about wiring in a 5spd ECU. By checking the codes you will see what other things may be causing issues. Your best bet is to try to get the previous owners mistakes fixed and go from there. Good luck.

[jaymatic]

You are correct, and obd2 car will need the crank angle sensor (CAS) or the computer will flip out. Even with a manual ECU the car will still throw a CEL unless it is wired up correctly with the neutral signal and 5th gear. There are tons of write ups on this OP search google about wiring in a 5spd ECU. By checking the codes you will see what other things may be causing issues. Your best bet is to try to get the previous owners mistakes fixed and go from there. Good luck.

Much appreciated man, will definitely look into this.

[ZERTA RACING]

Here I will help you out a little.

http://www.ka24development.com/cwilfert/S14_tranny_swap_electrical.html
You will need the correct ECU for a 1997- 1998 that is an MT.
There is the way the wiring should be when a manual ECU is connected. However the step where he says don't connect is false if you use a manual ECU. I connected it and no more CEL, however I would cross reference your wire pin out on the on the ECU to make sure you have the correct wires lol especially since you are cutting into your factory harness. If you can get ahold of an Factory service manual (FSM) for a 1998 240sx it will be you best friend for any other repair you may need to tackle.

[jaymatic]

Here I will help you out a little.

http://www.ka24development.com/cwilfert/S14_tranny_swap_electrical.html
You will need the correct ECU for a 1997- 1998 that is an MT.
There is the way the wiring should be when a manual ECU is connected. However the step where he says don't connect is false if you use a manual ECU. I connected it and no more CEL, however I would cross reference your wire pin out on the on the ECU to make sure you have the correct wires lol especially since you are cutting into your factory harness. If you can get ahold of an Factory service manual (FSM) for a 1998 240sx it will be you best friend for any other repair you may need to tackle.

do you have any idea where I can get the correct ecu for the 98? (besides eBay lol.)

[ZERTA RACING]

do you have any idea where I can get the correct ecu for the 98? (besides eBay lol.)

For sale section on here possibly.

Or post up in the want to buy section for what you looking for.

[DILLONDILLONDILLON!]

OP shoot me over the vin and ill be able to get you the correct part number for the ecu

[joeapple8]

OP shoot me over the vin and ill be able to get you the correct part number for the ecu


won't work because his car is converted to manual from auto, vin will register the car as an auto which will give the auto ecu p/n.

[DILLONDILLONDILLON!]

won't work because his car is converted to manual from auto, vin will register the car as an auto which will give the auto ecu p/n.

lol ahh yeah i forgot well this is what i have as in p.n but they have long been discontinued :

23710-81F02

23710-81F12

23710-81F79

23710-81F79

Those are the numbers after the supercessions. the remans usually have the same number with an "RE" at the end. hope it helps alittle dude

[joeapple8]

the AT you need to jump the wires on the inhibitor switch on the tranny, the colors are black with a yellow stripe, and the one that is black with the white stripe. If I remember correctly it is a plug seperate from the main inhibitor switch harness.

taken from Nico club lol